JP2006352995A - Sealing oil supply device - Google Patents

Abstract

A sealed oil supply device capable of reliably discharging water to the outside and preventing oil leakage.
A sealing oil supply device 1 supplies sealing oil to a sealer 7 that closes a gap between a sealed container 3 of a hydrogen-cooled turbine generator 2 in which hydrogen gas is sealed and a rotary shaft 4 that penetrates the sealed container 3. The vacuum tank 8 for vacuum degassing the sealing oil, the sealing oil pump 11 for supplying the sealing oil to the sealer 7, the vacuum pump 19 for evacuating the vacuum tank 8, and the vacuum pump 19. An oil separator 16 that separates water-containing gas from the lubricating oil, an amount of water glass gauge 22 in which the separated water accumulates, an LED element 24 and a photodiode 25 that output a signal corresponding to the level of the accumulated water, An on-off valve provided on the downstream side of the water meter glass gauge 22 and a control unit 27 that opens the on-off valve based on a signal and discharges water from the water meter glass gauge 22 are provided.
[Selection] Figure 1

Description

  The present invention relates to a sealing oil supply device that supplies sealing oil to a sealer provided to seal a gap between a sealed container of a rotating electrical machine in which hydrogen gas is sealed and a rotating shaft that penetrates the sealed container with oil.

A conventional sealing oil device for a turbine generator has a vacuum tank, a sealing oil pump, a differential pressure adjusting valve, a vacuum pump, and the like, and a shaft seal portion (corresponding to the “sealing device” of the present invention) of the turbine generator. Sealing oil is pressurized and supplied by a sealing oil pump to seal the gas inside the turbine generator.
The drain outlet of the drain chamber (corresponding to the “oil separator” of the present invention) connected to the vacuum pump is provided with a float made of a material having a specific gravity of about 0.9. When only the lubricating oil is contained in the drain chamber, a float having a specific gravity larger than that of the lubricating oil sinks, and the drain outlet is blocked to prevent the lubricating oil from flowing out. On the other hand, when water is accumulated in the drain chamber, a float having a specific gravity lower than that of the water rises, and the drain discharge port is opened, so that only water located in the lower layer of the lubricating oil layer can be automatically discharged ( For example, see Patent Document 1).

Japanese Utility Model Publication No. 4-21164

  In conventional turbine generator sealing oil devices, water in the drain chamber is automatically discharged by using a float made of a material having a specific gravity between the specific gravity of water and the specific gravity of oil. Since the specific gravity difference between the float and the float is small, there is a problem that the float cannot close the drain outlet with a sufficient force and the oil leaks.

  An object of the present invention is to solve the above-described problems. An object of the present invention is to provide a sealed oil supply device that can reliably discharge water to the outside and prevent oil leakage. Is to provide.

  The sealing oil supply device according to the present invention supplies a sealing oil to a sealer provided to seal a gap between a sealed container of a rotating electrical machine in which hydrogen gas is sealed and a rotating shaft penetrating the sealed container with oil. A vacuum tank for vacuum degassing the sealing oil discharged from the sealing device, a sealing oil pump for supplying the sealing oil in the vacuum chamber to the sealing device, and a vacuum for evacuating the vacuum chamber A pump, an oil separator that separates water-containing gas from lubricating oil discharged from the vacuum pump, a reservoir that is connected to the oil separator and accumulates water, and a reservoir that is provided in the reservoir Water level detecting means for outputting a signal corresponding to the water level, an on-off valve provided on the downstream side of the water reservoir, and opening and closing the open / close valve based on the signal from the water level detecting means. And a control unit that discharges water from the water unit.

  According to the sealing oil supply device of the present invention, the water level accumulated in the reservoir is detected by the water level detection means and a signal is output to the controller, and the controller operates the on-off valve based on the signal. Water can be reliably discharged to the outside and oil leakage can be prevented.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding members and parts will be described with the same reference numerals.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram showing a sealing oil supply device 1 according to Embodiment 1 of the present invention together with a hydrogen-cooled turbine generator 2. FIG. 2 is an enlarged view of a main part of FIG.
1 and 2, a hydrogen-cooled turbine generator 2 that is a rotating electrical machine includes a sealed container 3 in which hydrogen gas is sealed, a rotating shaft 4 that penetrates the sealed container 3, and axial ends of the sealed container 3. And a provided bearing chamber 5. The bearing chamber 5 includes a bearing 6 that supports the rotating shaft 4 and a sealer 7 that seals a gap between the sealed container 3 and the rotating shaft 4 using sealing oil.

The sealing oil and the bearing oil discharged from the sealer 7 and the bearing 6 are returned to the vacuum tank 8 through which the sealing oil and the bearing oil are evacuated through the sealing oil discharge pipe 9.
The upstream side of the sealer 7 and the vacuum chamber 8 are connected to each other via a seal oil supply pipe 10 that introduces seal oil into the sealer 7.

A sealing oil pump 11 that supplies the sealing oil in the vacuum chamber 8 to the sealing device 7 and a differential pressure adjustment valve 12 that adjusts the hydraulic pressure of the sealing oil supplied to the sealing device 7 are attached to the sealing oil supply pipe 10. It has been.
The differential pressure regulating valve 12 detects the gas pressure of the hydrogen gas sealed in the hermetic container 3 and the hydraulic pressure of the sealing oil that is made sufficiently higher than the gas pressure by the sealing oil pump 11 than the gas pressure. The seal oil is allowed to pass by being reduced to an increase by any predetermined value.
Further, between the sealing oil pump 11 of the sealing oil supply pipe 10 and the differential pressure adjusting valve 12, an end of a sealing oil return pipe 13 for returning the sealing oil that cannot pass through the differential pressure adjusting valve 12 to the vacuum chamber 8 is connected. Has been.

The vacuum tank 8 is connected to an oil level control valve 14 for maintaining the oil level of the sealing oil constant, and a sealing oil return pipe 13, and an injection nozzle 15 for injecting the returned sealing oil into the vacuum tank 8. And are attached.
A gas discharge pipe 17 for discharging gas is connected to the vacuum chamber 8, and the gas discharge pipe 17 is connected to a vacuum pump 19 via an open valve 18 when the sealing oil supply device 1 is operated. . The vacuum pump 19 is connected to a lubricating oil supply pipe 33 that supplies lubricating oil and a lubricating oil discharge pipe 34 that discharges lubricating oil containing gas. The lubricating oil discharge pipe 34 is connected to the oil separator 16 that separates the gas containing water from the lubricating oil discharged from the vacuum pump 19.
Note that the lubricating oil used in the vacuum pump 19 is the same type of oil as the sealing oil.

  The oil separator 16 has a discharge pipe 20 that discharges the exhaust gas to the outside, and a valve 21 that is normally open when the sealing oil supply device 1 is operated. A glass gauge 22 (water storage part) is connected. In addition, a drain pipe 23 for draining the accumulated water to the outside is connected to the water meter glass gauge 22.

Further, an LED element 24 (light emitting unit) mounted to emit light in the horizontal direction and the LED element 24 are horizontally opposed to the metering water glass gauge 22 with the metering water glass gauge 22 interposed therebetween, and the LED element 24 A photodiode 25 (light receiving unit) that receives the light emitted from the light through a light receiving lens (not shown) and outputs an electric signal having a current value corresponding to the amount of received light is attached.
Here, the LED element 24 and the photodiode 25 constitute water level detection means.
An electromagnetic valve (open / close valve) 26 that opens and closes the drain pipe 23 is attached to the drain pipe 23.

The photodiode 25 and the electromagnetic valve 26 operate the electromagnetic valve 26 in response to the above electric signal, and signal lines to the control unit 27 that discharges the water accumulated in the water meter glass gauge 22 through the drain pipe 23 to the outside. Connected by.
The control unit 27 is composed of a microprocessor (not shown) having a storage unit storing a program and a CPU.
Further, the solenoid valve 26 transmits its own operation state to the control unit 27 as a state signal. The control unit 27 performs abnormality determination on the water level detection means and the electromagnetic valve 26 based on the electrical signal and the state signal.

Hereinafter, the operation of the sealing oil supply apparatus 1 having the above configuration will be described.
The sealing oil in the vacuum chamber 8 is sent to the sealing oil supply pipe 10 by the operation of the sealing oil pump 11. The oil pressure of the sent sealing oil is reduced by the differential pressure regulating valve 12 and introduced into the sealer 7. Sealing oil that cannot pass through the differential pressure adjusting valve 12 is returned to the vacuum chamber 8 via the sealing oil return pipe 13.
The sealing oil introduced into the sealer 7 contains air, hydrogen gas, and water by touching the outside air when flowing along the rotary shaft 4 inside the sealer 7, and the vacuum tank passes through the seal oil discharge pipe 9. Returned to 8.

  A gas containing air, hydrogen gas, and water in the vacuum chamber 8 is sent to the gas exhaust pipe 17 as exhaust gas by the operation of the vacuum pump 19. The exhaust gas is taken into the lubricating oil by the vacuum pump 19 and introduced into the oil separator 16. In the oil separator 16, the exhaust gas containing water is separated from the lubricating oil by changes in pressure and temperature, and the water is condensed and stored in the water meter glass gauge 22. The exhaust gas is discharged to the outside through the discharge pipe 20.

The water level stored in the water meter glass gauge 22 is detected by a water level detecting means comprising an LED element 24 and a photodiode 25.
The light emitted from the LED element 24 is received by the photodiode 25 through the liquid inside the water meter glass gauge 22. Here, when the liquid between the LED element 24 and the photodiode 25 inside the water meter glass gauge 22 is a lubricating oil, the light transmittance of the lubricating oil is generally smaller than that of water. The amount of received light received by the diode 25 decreases, and the electrical signal output to the control unit 27 decreases.

  On the other hand, when the amount of water accumulated in the water meter glass gauge 22 increases and the water level rises, and the liquid between the LED element 24 and the photodiode 25 inside the water meter glass gauge 22 becomes water, Since the light transmittance is higher than that of the lubricating oil, the amount of received light received by the photodiode 25 increases, and the electrical signal output to the control unit 27 increases.

  Therefore, the threshold between the current value of the electrical signal when the liquid between the LED element 24 and the photodiode 25 in the water glass gauge 22 is lubricating oil and the current value of the electrical signal when water is water. By setting the value, the water level accumulated in the water meter glass gauge 22 is detected.

When an electric signal higher than the threshold value is input, the control unit 27 outputs an operation signal for opening the drain pipe 23 to the electromagnetic valve 26 for a predetermined time.
The drain pipe 23 is opened for a predetermined time by the operation of the electromagnetic valve 26, and the water inside the water meter glass gauge 22 is discharged.
Here, the mounting position of the LED element 24 and the photodiode 25 and the opening time of the drain pipe 23 are arbitrarily set depending on the usage state of the sealing oil supply device 1 and the like.

  Moreover, when the control part 27 does not receive the electrical signal from the photodiode 25, it detects that the water level detection means is abnormal, and issues an abnormality alarm to the outside. If the state signal is not received from the electromagnetic valve 26 even though the electrical signal is higher than the threshold value, it is detected that the electromagnetic valve 26 is abnormal and an abnormal alarm is issued. .

  According to the sealing oil supply device 1 according to the first embodiment of the present invention, the water level accumulated in the water meter glass gauge 22 is detected using the LED element 24 and the photodiode 25, and an electric signal is sent to the control unit 27. Since the control unit 27 operates the solenoid valve 26 based on the electrical signal to open the drain pipe 23 for a predetermined time, the water inside the water meter glass gauge 22 can be discharged to prevent leakage of the lubricating oil. it can.

  Further, since the control unit 27 determines abnormality of the water level detection means and the electromagnetic valve 26 based on the electric signal from the photodiode 25 and the state signal from the electromagnetic valve 26, when the abnormality occurs in the sealing oil supply device 1. However, since the abnormality can be detected early, damage can be reduced.

Embodiment 2. FIG.
FIG. 3 is an enlarged view of a main part showing a sealing oil supply apparatus 1A according to Embodiment 2 of the present invention. FIG. 4 is an enlarged view showing the water-glass gauge 22A of FIG. 3 in more detail.
3 and 4, the metered water glass gauge 22A includes an LED element 24 (light emitting unit) and two photodiodes 25A (with a height difference) facing the LED element 24 with the metered water glass gauge 22A interposed therebetween. First light receiving part) and 25B (second light receiving part) are attached.
Here, the LED element 24 and the photodiodes 25A and 25B constitute a water level detecting means.

Here, when the refractive index of water is 1.33 and the refractive index of the lubricating oil is 1.5, the LED element 24 and the photodiode 25A are approximately about the longitudinal axis of the water glass gauge 22A, respectively. They are attached to each other with an angle of 60 [°]. On the other hand, the photodiode 25B is mounted to face the LED element 24 at an angle of about 73 [°] with respect to the longitudinal axis of the water meter glass gauge 22A.
Other configurations are the same as those of the first embodiment, and the description thereof is omitted.

The operation of the sealing oil supply apparatus 1A having the above configuration will be described below. Note that the description of the same operation as in the first embodiment is omitted.
The light emitted from the LED element 24 passes through the liquid inside the water meter glass gauge 22A and is received by one of the photodiodes 25A and 25B. Here, when the liquid between the LED element 24 and the photodiodes 25A and 25B inside the water glass gauge 22A is only lubricating oil, the light travels straight without being refracted and is received by the photodiode 25A.

  On the other hand, when the amount of water accumulated in the water glass gauge 22A increases and the water level rises, and the interface between the water and the lubricating oil rises between the LED element 24 and the photodiode 25A, the light is refracted at the interface. . That is, the light emitted from the LED element 24 is incident on the interface at an incident angle of 60 degrees. Here, since the refractive index of water is 1.33, the refraction angle of light is 73 degrees and is not received by the photodiode 25A but is received by the photodiode 25B.

When an electrical signal is input from the photodiode 25B, the control unit 27A outputs an operation signal for opening the drain pipe 23 to the electromagnetic valve 26 for a predetermined time.
The drain pipe 23 is opened for a predetermined time by the operation of the electromagnetic valve 26, and the water inside the water meter glass gauge 22A is discharged.
Here, the mounting position of the LED element 24 and the photodiodes 25A and 25B and the opening time of the drain pipe 23 are arbitrarily set depending on the usage status of the sealing oil supply apparatus 1A.

  According to the sealing oil supply device 1A according to Embodiment 2 of the present invention, the solenoid valve 26 depends on which photodiode 25A, 25B outputs the electrical signal without using a threshold value for the current value of the electrical signal. The water level can be detected more accurately.

In the first and second embodiments described above, the LED element 24 is used as the light emitting unit. However, the present invention is not limited to this and may be a light emitting element such as a semiconductor laser. In this case, the same effects as those of the first and second embodiments can be obtained.
Further, the light receiving element is not limited to the photodiodes 25, 25A, and 25B, and may be other light receiving elements.

Embodiment 3 FIG.
FIG. 5 is an enlarged view of a main part showing a sealing oil supply apparatus 1B according to Embodiment 3 of the present invention.
In FIG. 5, the float glass gauge 22B is made of a substance having a specific gravity between the specific gravity of water and the specific gravity of the lubricating oil, and floats at the interface between the water and the lubricating oil to detect the water level. 28 is provided. Further, a level switch 29 that outputs a signal corresponding to the position of the float 28 is attached to the water meter glass gauge 22B.
Here, the float 28 and the level switch 29 constitute water level detection means.

An upper limit position and a lower limit position of the interface are set in the quantity water glass gauge 22B. When the float 28 is in the upper limit position, the level switch 29 outputs an upper limit signal to the control unit 27B. If it is in the lower limit position, a lower limit signal is output to the control unit 27B.
Other configurations are the same as those of the first embodiment, and the description thereof is omitted.

Hereinafter, the operation of the sealing oil supply apparatus 1B having the above configuration will be described. Note that the description of the same operation as in the first embodiment is omitted.
When water accumulates in the water meter glass gauge 22B and the float 28 reaches the upper limit position, an upper limit signal is output from the level switch 29 to the control unit 27B. The control unit 27B outputs an operation command for opening the drain pipe 23 to the electromagnetic valve 26 based on the upper limit signal. The drain pipe 23 is opened by the operation of the electromagnetic valve 26, and the water inside the water meter glass gauge 22B is discharged.

  Subsequently, when water is discharged and the float 28 reaches near the lower limit, a lower limit signal is output from the level switch 29 to the control unit 27B. The control unit 27B outputs an operation command for closing the drain pipe 23 to the electromagnetic valve 26 based on the lower limit signal. The drain pipe 23 is closed by the operation of the electromagnetic valve 26, and the discharge of water inside the water meter glass gauge 22B is terminated.

  According to the sealing oil supply device 1B according to Embodiment 3 of the present invention, the level switch 29 can detect two water levels, so it is not necessary to set the time for opening the drain pipe 23, and reliably Only water can be drained.

Embodiment 4 FIG.
FIG. 6 is an enlarged view of a main part showing a sealing oil supply apparatus 1C according to Embodiment 4 of the present invention.
In FIG. 6, a pair of electrodes 32 and a conductivity meter 30 that measures the electrical conductivity of water or lubricating oil between the electrodes 32 and outputs the electrical conductivity are attached to the quantity water glass gauge 22C. .
Here, the electrode 32 and the conductivity meter 30 constitute water level detection means.
Other configurations are the same as those of the first embodiment, and the description thereof is omitted.

Hereinafter, the operation of the sealing oil supply apparatus 1C having the above configuration will be described. Note that the description of the same operation as in the first embodiment is omitted.
For the liquid near the electrode 32 in the water glass gauge 22C, the resistance value between the electrodes 32 is measured by using, for example, a Wheatstone bridge circuit (not shown) provided in the conductivity meter 30, and the electrical conductivity is calculated. The Here, the electrical conductivity of water and the lubricating oil is about 1 [μS / cm] for water and about 10 ⁻⁶ [μS / cm] for the lubricating oil, and between the two is the 10 6th power. There is a difference in degree. Therefore, it can be determined whether the liquid near the electrode 32 is water or lubricating oil, and the water level is detected.

When the electrical conductivity input from the conductivity meter 30 is a value in the vicinity of 1 [μS / cm], the control unit 27C outputs an operation signal for opening the drain pipe 23 to the electromagnetic valve 26 for a predetermined time.
The drain pipe 23 is opened for a predetermined time by the operation of the electromagnetic valve 26, and the water inside the water meter glass gauge 22C is discharged.
Here, the opening time of the drain pipe 23 is arbitrarily set depending on the usage state of the sealing oil supply device 1C.

  According to the sealing oil supply device 1C according to the fourth embodiment of the present invention, since the difference in electrical conductivity between water and lubricating oil is very large, it is possible to reduce false detection and more reliably detect the water level. it can.

Embodiment 5. FIG.
FIG. 7 is a main part enlarged view showing a sealing oil supply apparatus 1D according to Embodiment 5 of the present invention.
In FIG. 7, an ultrasonic sensor 31 that emits ultrasonic waves to the interface between water and lubricating oil, measures the distance to the interface between water and lubricating oil, and outputs the distance is attached to the quantity water glass gauge 22D. It has been.
Here, the ultrasonic sensor 31 constitutes a water level detection means.
Other configurations are the same as those of the first embodiment, and the description thereof is omitted.

Hereinafter, operation | movement about the sealing oil supply apparatus 1D of the said structure is demonstrated. Note that the description of the same operation as in the first embodiment is omitted.
The ultrasonic sensor 31 emits ultrasonic waves toward the interface between water and lubricating oil. Some ultrasonic waves reflected by the interface are received by the ultrasonic sensor 31. In the ultrasonic sensor 31, the distance to the interface is calculated based on the time required for transmission and reception, and the water level is detected.

  When water accumulates in the quantity water glass gauge 22D and the water level rises above an arbitrary upper limit value, the control unit 27D outputs an operation command for opening the drain pipe 23 to the electromagnetic valve 26. The drain pipe 23 is opened by the operation of the electromagnetic valve 26, and the water inside the water meter glass gauge 22D is discharged.

  Subsequently, when water is discharged and the water level reaches the lower limit, the control unit 27D outputs an operation command for closing the drain pipe 23 to the electromagnetic valve 26. The drain pipe 23 is closed by the operation of the electromagnetic valve 26, and the discharge of water inside the water meter glass gauge 22D is terminated.

According to the sealing oil supply device 1D according to the fifth embodiment of the present invention, since the water level can be detected by the ultrasonic sensor 31, only water can be reliably discharged.
In addition, since the current water level can be known, the water level can be easily managed even from a remote location by connecting the control unit 27D to a control room or the like provided remotely.

  In the first to fifth embodiments, the electromagnetic valve 26 is connected to the drain pipe 23. However, the present invention is of course not limited to this, and an electromagnetic valve is provided at the lower portion of the water glass gauge. The water may be discharged by opening and closing the electromagnetic valve. In this case, the same effects as those of the first to fifth embodiments can be obtained.

It is a block diagram which shows the hydrogen-cooled turbine generator containing the sealing oil supply apparatus which concerns on Embodiment 1 of this invention. It is a principal part enlarged view of FIG. It is a principal part enlarged view which shows the sealing oil supply apparatus which concerns on Embodiment 2 of this invention. It is an enlarged view which shows the amount water glass gauge of FIG. 3 in detail. It is a principal part enlarged view which shows the sealing oil supply apparatus which concerns on Embodiment 3 of this invention. It is a principal part enlarged view which shows the sealing oil supply apparatus which concerns on Embodiment 4 of this invention. It is a principal part enlarged view which shows the sealing oil supply apparatus which concerns on Embodiment 5 of this invention.

Explanation of symbols

  1, 1A-1D Sealed oil supply device, 2 Hydrogen cooled turbine generator, 3 Sealed container, 4 Rotating shaft, 7 Sealer, 8 Vacuum tank, 11 Sealed oil pump, 16 Oil separator, 19 Vacuum pump, 22, 22A -22D Water glass gauge (water storage part), 23 Drain tube, 24 LED element (light emitting part), 25, 25A, 25B Photodiode (light receiving part, first light receiving part, second light receiving part), 26 Electromagnetic Valve (open / close valve), 27, 27A to 27D, control unit, 28 float, 29 level switch, 30 conductivity meter, 31 ultrasonic sensor, 32 electrodes.

Claims (8)

A sealing oil supply device that supplies sealing oil to a sealer provided to seal a gap between a sealed container of a rotating electrical machine in which hydrogen gas is sealed and a rotating shaft that penetrates the sealed container with oil,
A vacuum chamber for vacuum degassing the sealing oil discharged from the sealer;
A sealing oil pump for supplying the sealing oil in the vacuum chamber to the sealer;
A vacuum pump for evacuating the vacuum chamber;
An oil separator for separating water-containing gas from the lubricating oil discharged from the vacuum pump;
A water storage unit connected to the oil separator to collect water;
A water level detecting means provided in the water reservoir, for detecting the water level of the water reservoir, and outputting a signal corresponding to the water level;
An on-off valve provided on the downstream side of the water reservoir,
A sealing oil supply device comprising: a control unit that opens the on-off valve based on a signal from the water level detection means and discharges water from the water storage unit.   The water level detection means includes a light emitting unit that emits light so as to pass horizontally through the water storage unit, and a light receiving unit that receives light passing through the water storage unit and outputs a signal corresponding to the amount of received light. The sealing oil supply device according to claim 1, wherein the device is a sealing oil supply device.   The water level detection means includes: a light emitting unit that emits light so as to pass through the water storage unit obliquely; a first light receiving unit that is disposed at a position that receives light traveling straight through the water storage unit; and the water storage unit 2. The sealing oil supply device according to claim 1, further comprising a second light receiving unit disposed at a position for receiving light refracted by a predetermined angle.   The said water level detection means has the float which floats the interface of the water in the said water storage part, and lubricating oil, and detects a water level, The level switch which detects the position of the said float is characterized by the above-mentioned. The sealing oil supply apparatus of description.   The said water level detection means has a pair of electrodes provided in the said water storage part, and the conductivity meter which measures the electrical conductivity of the liquid which exists between the said electrodes, The sealing of Claim 1 characterized by the above-mentioned. Oil supply device.   The said water level detection means has an ultrasonic sensor which detects a water level with the ultrasonic wave which emits an ultrasonic wave and reflected in the interface of the water in the said water storage part, and lubricating oil. Sealed oil supply equipment.   The sealing oil supply device according to any one of claims 1 to 6, wherein the on-off valve is an electromagnetic valve that transmits its operating state to the control unit.   The control unit detects and notifies an abnormality of the water level detection means or the electromagnetic valve based on at least one of a signal input from the water level detection means and an operation state transmitted from the electromagnetic valve. The sealing oil supply device according to claim 7.

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